battery charging temperature compensation

[kell]

Found a reference for lead acid; about -5.5 mV/*C per cell.
Seeking the same info for li-ion.

With lead acid you would get a 1% compensation differential with a 4.4
degrees centigrade change. If li-ion batteries were to require
compensation of the charging voltage versus temperature on the same
order of magnitude, then that would take you outside the 1% voltage
regulation specified for li-ion batteries even within a fairly narrow
temperature window. But I can't find any information about this.

 

[PeteS]

Li+ batteries, when charged using constant current/constant voltage (as
specified by the manufacturer) require no temperature compensation in
the charger when being charged within their acceptable temperatures.

For Li+, charging should only start when 0C <= T(batt) <= 40C. Charging
can continue for 0C <= T(batt) <= 45C. Li+ should not be charged
outside these temperature limits (for safety reasons).

Cheers

PeteS

 

[kell]

Li+ batteries, when charged using constant current/constant voltage (as
specified by the manufacturer) require no temperature compensation in
the charger when being charged within their acceptable temperatures.

For Li+, charging should only start when 0C <= T(batt) <= 40C. Charging
can continue for 0C <= T(batt) <= 45C. Li+ should not be charged
outside these temperature limits (for safety reasons).

show me a link where I can look at that information.

 

[kell]

Li+ batteries, when charged using constant current/constant voltage (as
specified by the manufacturer) require no temperature compensation in
the charger when being charged within their acceptable temperatures.

For Li+, charging should only start when 0C <= T(batt) <= 40C. Charging
can continue for 0C <= T(batt) <= 45C. Li+ should not be charged
outside these temperature limits (for safety reasons).

It will take more than a blanket statement to convince me that
temperature has no effect on the chemistry.

 

[PeteS]

Grumpy today are we?

Temperature *does* have an effect on the chemistry. read carefully what
I actually said:

<< require no temperature compensation in the charger when being
charged within their acceptable temperatures >>

There's that note about acceptable temperature ranges. Indeed, it is
because of chemistry changes that one should not charge the device
outside the temperature range I stated. Unlike other chemistries where
we can compensate a little for a wider temperature range, Li+ and
LiPoly are not susceptible to this technique.

As to manufacturer's documentation, they are a google search away.

Try varta batteries (They are one of the many suppliers I use).

http://www.varta-microbattery.com/en/oempages/index.htm

You can also look for scholarly papers on the actual chemical effects
within Li+ quite easily.

Cheers

PeteS